The best files for manipulation are *.3ds
You dismantle and move the objects in Blender3D is free.
In CamBam you do:
Select the objects
Edit --> Transform --> Resize
Edit --> Transform --> Align
An excellent archive spitfire.3ds you find here:http://thefree3dmodels.com/stuff/aircraft/supermarine_spitfire/15-1-0-1575
Your file of mesh is faulty.
Only problem is the joints and rivets see photo attached.